They're hopelessly confusing a.t.m. but during some playtesting we got rather inspired by the chariotraces rules for movement/turning, and decided that's the way to go...
we're currently working out the details (also figuring out how to handle the out of control table, as you can get your cart destroyed and on the other end of the table in one single turn with the current rules... - quite easily as a single hit would cause a roll, and from there on hits just keep coming in...)
But when we've got them figured out we'll post the stuff here.